package com.atguigu.gmall.realtime.app.func;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.atguigu.gmall.realtime.beans.TableProcess;
import org.apache.flink.api.common.state.BroadcastState;
import org.apache.flink.api.common.state.MapStateDescriptor;
import org.apache.flink.api.common.state.ReadOnlyBroadcastState;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.co.BroadcastProcessFunction;
import org.apache.flink.util.Collector;

import java.sql.*;
import java.util.*;

/**
 * @author Felix
 * @date 2023/6/13
 * 事实表动态分流实现
 */
public class BaseDbTableProcessFunction extends BroadcastProcessFunction<JSONObject,String,JSONObject> {

    private MapStateDescriptor<String, TableProcess> mapStateDescriptor;

    private Map<String,TableProcess> configMap = new HashMap<>();

    public BaseDbTableProcessFunction(MapStateDescriptor<String, TableProcess> mapStateDescriptor) {
        this.mapStateDescriptor = mapStateDescriptor;
    }

    @Override
    public void open(Configuration parameters) throws Exception {
        //将配置信息预加载到configMap集合中
        //注册驱动
        Class.forName("com.mysql.cj.jdbc.Driver");
        //获取连接
        Connection conn = DriverManager.getConnection("jdbc:mysql://hadoop102:3306/gmall1219_config?" +
            "user=root&password=123456&useUnicode=true&" +
            "characterEncoding=utf8&serverTimeZone=Asia/Shanghai&useSSL=false");

        String sql = "select * from gmall1219_config.table_process where sink_type = 'dwd'";
        //获取数据库操作对象
        PreparedStatement ps = conn.prepareStatement(sql);
        //执行SQL
        ResultSet rs = ps.executeQuery();
        ResultSetMetaData metaData = rs.getMetaData();
        //处理结果集
        while (rs.next()){
            //定义一个json对象，接收遍历出来的一条记录
            JSONObject jsonObj = new JSONObject();
            for (int i = 1; i <= metaData.getColumnCount(); i++) {
                String columnName = metaData.getColumnName(i);
                Object columnValue = rs.getObject(i);
                jsonObj.put(columnName,columnValue);
            }
            //将json对象转换为TableProcess对象
            TableProcess tableProcess = jsonObj.toJavaObject(TableProcess.class);
            String sourceTable = tableProcess.getSourceTable();
            String sourceType = tableProcess.getSourceType();
            String key = sourceTable + ":" + sourceType;
            configMap.put(key,tableProcess);
        }
        //释放资源
        rs.close();
        ps.close();
        conn.close();
    }

    //处理主流业务数据
    @Override
    public void processElement(JSONObject jsonObj, ReadOnlyContext ctx, Collector<JSONObject> out) throws Exception {
        //获取广播状态
        ReadOnlyBroadcastState<String, TableProcess> broadcastState = ctx.getBroadcastState(mapStateDescriptor);
        //获取操作的业务数据库表的表名
        String table = jsonObj.getString("table");
        //获取对业务数据库表的操作类型
        String type = jsonObj.getString("type");
        //将表名和操作类型拼接为key
        String key = table + ":" + type;
        //根据key到广播状态中获取对应的配置信息
        TableProcess tableProcess = null;

        if((tableProcess = broadcastState.get(key)) != null ||
            (tableProcess = configMap.get(key)) != null){
            //如果配置信息不为空，说明当前处理的这条数据，是需要动态分流处理的事实数据
            JSONObject dataJsonObj = jsonObj.getJSONObject("data");
            //在向下游传递前,过滤掉不需要传递到下游的属性
            String sinkColumns = tableProcess.getSinkColumns();
            filterColumn(dataJsonObj,sinkColumns);
            //在向下游传递前,补充输出的目的地
            String sinkTable = tableProcess.getSinkTable();
            dataJsonObj.put("sink_table",sinkTable);
            out.collect(dataJsonObj);
        }

    }

    //过滤掉不需要传递的属性
    private void filterColumn(JSONObject dataJsonObj, String sinkColumns) {
        String[] fieldArr = sinkColumns.split(",");
        List<String> fieldList = Arrays.asList(fieldArr);
        Set<Map.Entry<String, Object>> entrySet = dataJsonObj.entrySet();
        entrySet.removeIf(entry->!fieldList.contains(entry.getKey()));
    }

    //处理广播流配置数据
    //"op":"r": {"before":null,"after":{"source_table":"activity_info","source_type":"ALL","sink_table":"dim_activity_info","sink_type":"dim","sink_columns":"id,activity_name,activity_type,activity_desc,start_time,end_time,create_time","sink_pk":"id","sink_extend":null},"source":{"version":"1.6.4.Final","connector":"mysql","name":"mysql_binlog_source","ts_ms":0,"snapshot":"false","db":"gmall1219_config","sequence":null,"table":"table_process","server_id":0,"gtid":null,"file":"","pos":0,"row":0,"thread":null,"query":null},"op":"r","ts_ms":1686039033812,"transaction":null}
    //"op":"c": {"before":null,"after":{"source_table":"aaa","source_type":"ALL","sink_table":"dim_a","sink_type":"dim","sink_columns":"id,name","sink_pk":"id","sink_extend":null},"source":{"version":"1.6.4.Final","connector":"mysql","name":"mysql_binlog_source","ts_ms":1686039145000,"snapshot":"false","db":"gmall1219_config","sequence":null,"table":"table_process","server_id":1,"gtid":null,"file":"mysql-bin.000003","pos":7520834,"row":0,"thread":null,"query":null},"op":"c","ts_ms":1686039144626,"transaction":null}
    //"op":"u": {"before":{"source_table":"aaa","source_type":"ALL","sink_table":"dim_bbb","sink_type":"dim","sink_columns":"id,name","sink_pk":"id","sink_extend":null},"after":{"source_table":"aaa","source_type":"ALL","sink_table":"dim_bbb","sink_type":"dim","sink_columns":"id,name,age","sink_pk":"id","sink_extend":null},"source":{"version":"1.6.4.Final","connector":"mysql","name":"mysql_binlog_source","ts_ms":1686039247000,"snapshot":"false","db":"gmall1219_config","sequence":null,"table":"table_process","server_id":1,"gtid":null,"file":"mysql-bin.000003","pos":7521609,"row":0,"thread":null,"query":null},"op":"u","ts_ms":1686039246661,"transaction":null}
    //"op":"d": {"before":{"source_table":"aaa","source_type":"ALL","sink_table":"dim_bbb","sink_type":"dim","sink_columns":"id,name,age","sink_pk":"id","sink_extend":null},"after":null,"source":{"version":"1.6.4.Final","connector":"mysql","name":"mysql_binlog_source","ts_ms":1686039321000,"snapshot":"false","db":"gmall1219_config","sequence":null,"table":"table_process","server_id":1,"gtid":null,"file":"mysql-bin.000003","pos":7522013,"row":0,"thread":null,"query":null},"op":"d","ts_ms":1686039320393,"transaction":null}
    @Override
    public void processBroadcastElement(String jsonStr, Context ctx, Collector<JSONObject> out) throws Exception {
        //为了处理方便，将jsonStr转换为jsonObj
        JSONObject jsonObj = JSON.parseObject(jsonStr);
        //获取广播状态
        BroadcastState<String, TableProcess> broadcastState = ctx.getBroadcastState(mapStateDescriptor);
        //获取操作类型
        String op = jsonObj.getString("op");
        if("d".equals(op)){
            //删除操作  将对应的配置信息从广播状态删掉
            TableProcess before = jsonObj.getObject("before", TableProcess.class);
            String sinkType = before.getSinkType();
            if("dwd".equals(sinkType)){
                String sourceTable = before.getSourceTable();
                String sourceType = before.getSourceType();
                String key = sourceTable + ":" + sourceType;
                broadcastState.remove(key);
                configMap.remove(key);
            }
        }else{
            //删除外的其它操作  将对应的配置信息添加或者更新到广播状态
            TableProcess after = jsonObj.getObject("after", TableProcess.class);
            String sinkType = after.getSinkType();
            if("dwd".equals(sinkType)){
                String sourceTable = after.getSourceTable();
                String sourceType = after.getSourceType();
                String key = sourceTable + ":" + sourceType;
                broadcastState.put(key,after);
                configMap.put(key,after);
            }
        }
    }
}
